############
Min-Jae didn't speak until they reached the top of the service stairwell.
He leaned his back against the cold tile of the landing, slid down until his rear hit the floor, and dropped the aluminum bat between his spread legs. His hands were raw. The friction from holding the crowbar against the thrashing centipede had torn the skin clean off both his palms, leaving ragged red strips of flesh that were already weeping clear fluid.
He looked down at his palms, then up at Kael, who was wiping the yellow grease from his blade with a piece of cardboard.
"Hyung."
"Don't pick at the skin," Kael said without looking up. "Let it clot. If you tear the flaps off, you invite infection."
"I'm not picking at it," Min-Jae said. His voice was cracked, rough around the edges. "I'm just... trying to remember if I ever held a bat this hard before. In high school, coach used to scream at me for gripping too tight on an inside fastball. He'd say, *'Relax your wrists, Min-Jae, you're choking the lumber.'* I thought that was the hardest thing I'd ever have to do."
He let out a short, hollow laugh that died in his throat.
"My mom's in Incheon," Min-Jae continued, staring at the floor between his sneakers. "She lives on the fourth floor of an old brick apartment near the docks. No elevator. Bad knees. When the sirens went off the first morning, before the cell towers stopped working, she called me twice. I was in the batting cage. I didn't pick up because coach had a rule about phones during practice."
Kael sheathed the knife. The leather strap clicked shut.
"You couldn't have made it to Incheon," Kael said. "The western expressway collapsed within three hours of the first siren. You would have died on the asphalt before you cleared the city limits."
"I know," Min-Jae whispered. "I know that logically. But I keep thinking... what if she was standing by the window waiting for me? What if she's still sitting there, rationing whatever side dishes she had in the fridge, thinking I'm just stuck in traffic?"
Kael sat down on the step three stairs above him. He rested his elbows on his knees, his scarred hands hanging loosely in front of him.
"She isn't thinking you're in traffic," Kael said evenly. "Nobody who saw the sky that morning thinks anyone is in traffic."
"That doesn't make it better, Hyung."
"It's not supposed to make it better. It stops you from lying to yourself. If you lie to yourself about the world outside this station, you start making stupid decisions. You walk out into an open street because you feel guilty, and something drops out of an office window and eats your face off before you hit the pavement."
Min-Jae looked up, his bloodshot eyes searching Kael's face. "Don't you have anyone? A brother? A girl you used to talk to? Anyone you're trying to get back to?"
"No."
"Nobody at all?"
"Nobody," Kael said. "When you spend ten years working contracts where people pay you to stand in front of gunfire, you stop keeping phone numbers. The people who care about you either get used as leverage or they spend their lives waiting for a body bag that never comes back in one piece. It's cleaner this way."
Min-Jae was quiet for a long moment. He wiped a dry smear of blood from under his nose with the back of his wrist. "Must be nice. Being empty."
"It's not nice," Kael replied, his voice dead flat. "It just means I don't have to waste energy crying while I'm trying to keep you breathing."
He stood up, reached down, and grabbed the collar of Min-Jae's blazer, pulling the boy to his feet with a single, effortless tug.
"Get up. Yuna needs to look at those hands before the tissue hardens wrong."
---
The main concourse was dead silent when the heavy steel fire door swung open.
The seventy survivors huddled across the station platform didn't look up with hope anymore. They looked up with that dull, hollow vigilance that people develop when they realize no sirens are coming.
Park was still standing near the ticket gates, his hands resting on his plumbing pipe. When he saw Kael and Min-Jae walk through, his eyes darted immediately to Kael's torn sleeve and the massive smear of yellow, acidic slime coating Min-Jae's pants.
"You... you killed it?" Park asked, his voice barely carrying over the quiet hum of the camp.
"It's dead," Kael said, not breaking his stride. "The passage beneath Line 4 is clear for now. But nobody goes near the southern maintenance shaft. If I catch anyone opening those fire doors, I'll throw them down the drop-shaft myself."
The man with the gold chain was sitting on his rolled-up blanket, watching them. He didn't say a word this time. His eyes stayed glued to the thick, violet glow bleeding through the canvas pocket of Kael's jacket. Even from ten yards away, the sheer density of the light was obvious. It wasn't the weak, flickering amber of the small hounds; it was a deep, electric purple that cast long, unnatural shadows against the tiled ceiling.
Kael walked straight past the crowds and pushed through the blue plastic tarp into the medical alcove.
Yuna was sitting on the edge of an empty cot, rolling clean gauze around a wooden tongue depressor to make finger splints. The three cloudy Grade 1 cores Kael had given her earlier were gone; in their place, a light, healthy color had returned to her cheeks, though the exhaustion in her posture remained.
She looked up as Kael entered, her gaze immediately dropping to Min-Jae's shredded hands.
"Sit," she told the boy, pointing to the cot opposite her.
Min-Jae sat down without a word, holding his trembling hands out like a child presenting a broken toy.
Yuna grabbed a bottle of saline solution and poured it generously over his palms. Min-Jae hissed through his teeth, his entire body stiffening, but he didn't pull away.
"You tore through the dermis," Yuna murmured, her fingers working with rapid, practiced efficiency. She reached into a small metal tray, brought her hand over his left palm, and closed her eyes.
A soft, emerald warmth flared from her fingers.
The light wasn't sputtering anymore. It flowed smoothly, like warm water spilling over cold porcelain. Underneath the green glow, the raw, bleeding meat of Min-Jae's palm began to tighten. The capillary bleeding stopped first, followed by a fine, spiderweb mesh of pale pink tissue that crawled across the open wound, sealing it into smooth, fresh skin within twenty seconds.
Min-Jae stared at his hand, flexing his fingers. "It... it doesn't even sting."
"It will in an hour," Yuna said, opening her eyes. Her breath was steady, but a bead of sweat formed at her temple. "I closed the surface layer and accelerated the cellular repair, but your tendons are inflamed. Don't swing that bat for twelve hours unless your life depends on it."
"Thank you, Miss Yuna," Min-Jae said quietly.
"Go find some water," she told him gently. "Park found a crate of bottled barley tea in the station master's office. Drink one. Go."
Min-Jae nodded, grabbed his bat, and slipped out from behind the tarp, leaving Kael and Yuna alone in the small, illuminated space.
Yuna turned to Kael. She crossed her arms, leaning against the metal frame of the cot.
"Show me," she said.
Kael reached into his inner pocket. He pulled out the violet core and laid it on the clean white towel spread across the milk crate.
The stone didn't just glow; it hummed. A low, sub-audible vibration emanated from the crystal, causing the saline bottle on the tray to ripple. The air inside the small enclosure grew instantly warmer, smelling sharply of ozone and scorched copper.
Yuna stared at it. She didn't touch it. Her medical training and her newly awakened senses were telling her two completely different things, and both of them were screaming that the object was biologically impossible.
"That's not Grade 1," she said softly.
"No. It belonged to an excavator. Nine feet of segmented bone plating and muscle fibers as thick as ship ropes."
"Where did it come from?"
"Below the bedrock," Kael said, pulling off his shredded jacket and tossing it onto the floor. "It was cutting through the blockage in the drainage main. It wanted the water level to drop."
Yuna looked up from the core to Kael's bare shoulders.
Her breath caught slightly.
The skin across his upper chest and left shoulder had completely transformed. The three claw marks from earlier weren't just healed; the surrounding skin had turned a dull, matte gray, slightly raised and textured like fine, flexible leather. When Kael rolled his shoulder, the muscle beneath moved with an unnatural, hydraulic density, the fibers visible beneath the taut skin like braided steel wires.
She stepped closer and placed her fingers directly over his collarbone.
Her touch was cool, but Kael felt an immediate, subtle prickle of energy beneath his skin—his own newly integrated traits instinctively stiffening against her bio-manipulation.
"Your resting pulse is forty-four," she said, her voice dropping into a tense whisper. "Your body temperature is nearly a hundred and two degrees, but you aren't sweating. Kael, your cells aren't just repairing damage anymore. They're rebuilding themselves out of something denser."
"Does it impair motor function?"
"No," she said, pulling her hand back and looking into his dark eyes. "That's what scares me. It's making you faster. It's making your bones harder to break. But biologically, you're moving away from what a human baseline is supposed to be. If this keeps happening with every grade... what happens to your organs? What happens to your brain?"
"The brain stays mine," Kael said. "Because I don't let the core dictate the change. The body adapts to the stress I put it through. If I need to be harder to break, it hardens. If I need to see in the dark, the pupils widen."
"And if you need to stop feeling?" she asked, her voice cracking with a sudden, sharp intensity that surprised even herself. "What if the stress of this world makes it easier to just... stop caring if those seventy people out there live or die? Will your brain adapt to that, too?"
Kael didn't answer immediately.
He picked up the violet core from the towel. The stone felt hot against his calloused skin, its internal energy swirling like a miniature storm trapped in glass.
"If I stopped caring," Kael said quietly, "I would have taken Min-Jae and walked out of this station three days ago. We would have cleared an apartment building, locked the reinforced doors, and survived on canned goods for six months while the rest of this city rotted."
Yuna looked at him, her lips pressed into a tight, pale line. "Then why stay down here? Why build a barricade out of trash and protect people who can't even swing a pipe without crying?"
"Because a man alone in a concrete box isn't surviving," Kael said. "He's just waiting for something bigger to figure out how to open the door."
He looked toward the blue tarp, listening to the muffled sounds of the camp outside—a mother quietly singing to a restless toddler, two men arguing in low whispers over a dry biscuit, the scrape of Min-Jae's shoes as the boy sat down near the fire door to keep watch.
"You need numbers," Kael continued, his voice steady and clinical. "You need people to haul stone, people to purify water, people to stitch wounds so the fighters don't die of gangrene three days after a win. You think I'm doing this because I'm a good person, Yuna?"
"I don't think you're a monster," she replied softly.
"I'm a mercenary," Kael said, looking back at her. "In my line of work, you don't build a fortress because you love the bricks. You build it because the open field belongs to the artillery. Right now, those monsters are the artillery. And this station is the only ditch we've got."
He extended his hand, offering the violet stone to her.
"Take it."
Yuna shook her head, taking half a step back. "I can't. My body can barely metabolize the Grade 1 fragments without sending my heart into arrhythmia. If I try to absorb a Grade 2 core right now, the energy will rupture my blood vessels."
"I'm not telling you to absorb it," Kael said. "I'm telling you to keep it in your medical kit. If I take a hit down there that crushes an internal organ, your normal reserves won't be enough to put me back together. You'll need to draw from this."
She looked at the glowing violet stone, then slowly reached out and took it from his palm.
The heat of the core transferred into her small hands. She wrapped it in the white towel with deliberate care, placed it into the bottom of her canvas field bag, and pulled the zipper shut. The violet glow vanished, returning the small medical corner to the dim, clinical yellow of the battery lamp.
"What's coming through that pipe, Kael?" she asked, looking at his bare, scarred back as he reached for a clean undershirt.
"The water in the drainage ditch was dropping when we left," Kael said, pulling the shirt over his head. "That means the river gate is open. Whatever was waiting on the other side of the Han River doesn't have to swim through four miles of submerged concrete anymore."
He picked up his tactical belt, buckling the heavy nylon strap around his waist with a sharp, metallic *click*.
"Get your trauma kits ready," Kael said, turning toward the tarp exit. "They won't wait for morning."